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Rostricellula lapworthi
Taxonomy
Rhynchonella lapworthi was named by Davidson (1883) [Rhynchonella Lapworthi
= Rhynchotreta ardmillanensis (Davidson MS.), Reed 1917, p. 941, pl. xxiv, fig. 17, non figs. 8-16.].
It was recombined as Rostricellula lapworthi by Williams (1962) and Candela and Harper (2014).
It was recombined as Rostricellula lapworthi by Williams (1962) and Candela and Harper (2014).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1883 | Rhynchonella lapworthi Davidson p. 154 figs. pl. x, fig. 7 |
| 1917 | Rhynchonella lapworthi Reed p. 939 figs. Plate XXIII, figs. 28-31 |
| 1962 | Rostricellula lapworthi Williams pp. 236 - 237 figs. P1. XXIV, figs. 21-24, 26; P1. XXIV, figs. 6, 31, 34, 36 |
| 2014 | Rostricellula lapworthi Candela and Harper pp. Supplement 1 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Rostricellula lapworthi Davidson 1883
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. R. C. Reed 1917 | This species has 4 ribs on the low fold in the brachial valve, 3 in the betterdefined sinus in the opposite valve, and 3-4 on each lateral lobe, with 1 or 2 smaller ones near the hinge and the lateral false areas. The ribs are all equal in size, except the marginal ones bounding the sinus, which become rather higher anteriorly, and the 1 or 2 cardinal ones which are smaller than the rest. DAVIDSON'S figure does not make the ribs on the fold straight enough, nor the top of the fold sufficiently flat; the sides of the sinus are also not shown as steep as they are in reality. This species much resembles Rh. insequivalve (Castelnau),| from the Trenton Formation of North America. | |
| A. Williams 1962 | Large, trigonal, unequally biconvex Rostricellula almost two-thirds as thick as the maximum width of the shell, pedicle valve less convex, medianly sulcate and almost as long as wide, brachial valve strongly convex, fold originating near the umbo and about two-thirds as wide at the anterior margin as the maximum width of the valve; radial ornamentation consisting of 13 sharp-crested costae with a wavelength of over 1 mm. ; 5 costae commonly occupy the fold; dental lamellae subparallel almost one-quarter of the length of the pedicle valve, dorsal median septum high and strong extending anteriorly for about one-half of the length of the brachial valve. |